// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/socket/unix_domain_server_socket_posix.h"

#include <memory>
#include <vector>

#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/files/scoped_temp_dir.h"
#include "base/run_loop.h"
#include "base/stl_util.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/base/test_completion_callback.h"
#include "net/socket/unix_domain_client_socket_posix.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace net {
namespace {

    const char kSocketFilename[] = "socket_for_testing";
    const char kInvalidSocketPath[] = "/invalid/path";

    bool UserCanConnectCallback(bool allow_user,
        const UnixDomainServerSocket::Credentials& credentials)
    {
        // Here peers are running in same process.
#if defined(OS_LINUX) || defined(OS_ANDROID)
        EXPECT_EQ(getpid(), credentials.process_id);
#endif
        EXPECT_EQ(getuid(), credentials.user_id);
        EXPECT_EQ(getgid(), credentials.group_id);
        return allow_user;
    }

    UnixDomainServerSocket::AuthCallback CreateAuthCallback(bool allow_user)
    {
        return base::Bind(&UserCanConnectCallback, allow_user);
    }

    class UnixDomainServerSocketTest : public testing::Test {
    protected:
        UnixDomainServerSocketTest()
        {
            EXPECT_TRUE(temp_dir_.CreateUniqueTempDir());
            socket_path_ = temp_dir_.path().Append(kSocketFilename).value();
        }

        base::ScopedTempDir temp_dir_;
        std::string socket_path_;
    };

    TEST_F(UnixDomainServerSocketTest, ListenWithInvalidPath)
    {
        const bool kUseAbstractNamespace = false;
        UnixDomainServerSocket server_socket(CreateAuthCallback(true),
            kUseAbstractNamespace);
        EXPECT_EQ(ERR_FILE_NOT_FOUND,
            server_socket.BindAndListen(kInvalidSocketPath, /*backlog=*/1));
    }

    TEST_F(UnixDomainServerSocketTest, ListenWithInvalidPathWithAbstractNamespace)
    {
        const bool kUseAbstractNamespace = true;
        UnixDomainServerSocket server_socket(CreateAuthCallback(true),
            kUseAbstractNamespace);
#if defined(OS_ANDROID) || defined(OS_LINUX)
        EXPECT_EQ(OK, server_socket.BindAndListen(kInvalidSocketPath, /*backlog=*/1));
#else
        EXPECT_EQ(ERR_ADDRESS_INVALID,
            server_socket.BindAndListen(kInvalidSocketPath, /*backlog=*/1));
#endif
    }

    TEST_F(UnixDomainServerSocketTest, ListenAgainAfterFailureWithInvalidPath)
    {
        const bool kUseAbstractNamespace = false;
        UnixDomainServerSocket server_socket(CreateAuthCallback(true),
            kUseAbstractNamespace);
        EXPECT_EQ(ERR_FILE_NOT_FOUND,
            server_socket.BindAndListen(kInvalidSocketPath, /*backlog=*/1));
        EXPECT_EQ(OK, server_socket.BindAndListen(socket_path_, /*backlog=*/1));
    }

    TEST_F(UnixDomainServerSocketTest, AcceptWithForbiddenUser)
    {
        const bool kUseAbstractNamespace = false;

        UnixDomainServerSocket server_socket(CreateAuthCallback(false),
            kUseAbstractNamespace);
        EXPECT_EQ(OK, server_socket.BindAndListen(socket_path_, /*backlog=*/1));

        std::unique_ptr<StreamSocket> accepted_socket;
        TestCompletionCallback accept_callback;
        EXPECT_EQ(ERR_IO_PENDING,
            server_socket.Accept(&accepted_socket, accept_callback.callback()));
        EXPECT_FALSE(accepted_socket);

        UnixDomainClientSocket client_socket(socket_path_, kUseAbstractNamespace);
        EXPECT_FALSE(client_socket.IsConnected());

        // Connect() will return OK before the server rejects the connection.
        TestCompletionCallback connect_callback;
        int rv = connect_callback.GetResult(
            client_socket.Connect(connect_callback.callback()));
        ASSERT_EQ(OK, rv);

        // Try to read from the socket.
        const int read_buffer_size = 10;
        scoped_refptr<IOBuffer> read_buffer(new IOBuffer(read_buffer_size));
        TestCompletionCallback read_callback;
        rv = read_callback.GetResult(client_socket.Read(
            read_buffer.get(), read_buffer_size, read_callback.callback()));

        // The server should have disconnected gracefully, without sending any data.
        ASSERT_EQ(0, rv);
        EXPECT_FALSE(client_socket.IsConnected());

        // The server socket should not have called |accept_callback| or modified
        // |accepted_socket|.
        EXPECT_FALSE(accept_callback.have_result());
        EXPECT_FALSE(accepted_socket);
    }

    TEST_F(UnixDomainServerSocketTest, UnimplementedMethodsFail)
    {
        const bool kUseAbstractNamespace = false;
        UnixDomainServerSocket server_socket(CreateAuthCallback(true),
            kUseAbstractNamespace);

        IPEndPoint ep;
        EXPECT_EQ(ERR_NOT_IMPLEMENTED, server_socket.Listen(ep, 0));
        EXPECT_EQ(ERR_NOT_IMPLEMENTED,
            server_socket.ListenWithAddressAndPort(kInvalidSocketPath,
                0,
                /*backlog=*/1));

        EXPECT_EQ(ERR_ADDRESS_INVALID, server_socket.GetLocalAddress(&ep));
    }

    // Normal cases including read/write are tested by UnixDomainClientSocketTest.

} // namespace
} // namespace net
